As we reported, the two ladies met to commemorate General Charles de Gaulle's 1940 radio broadcast to Nazi-occupied France.
Carla then published her impressions on Sam:
She wrote: "The companion of the new UK head of government is a kind of fashion icon: until now artistic director of the luxury paper company Smythson, Samantha Cameron combines stylishness with a feel for her time.
"Aristocratic but bohemian, practitioner of yoga and close to the ecological cause, this mother of three has retained from her youth a dolphin tattoo.
"A maverick style for a woman who, when questioned about her husband, does not hesitate to speak not only of his good qualities but also of the minor failings of everyday life."